> OK, that suggests setting at the options level would solve both of your
> problems and that seems like the best approach. I don't really want to
> pass this around as a parameter through the maze of functions that might
> actually download something if we don't have to.

+ \item{\code{HTTPUserAgent}:}{string used as the user agent in HTTP
+ requests. If \code{NULL}, HTTP requests will be made without a
+ user agent header. The default is \code{R (<version> <platform>
+ <arch> <os>)}}
+
\item{\code{internet.info}:}{The minimum level of information to be
printed on URL downloads etc. Default is 2, for failure causes.
Set to 1 or 0 to get more information.}